Quantum Critical Dynamics of a Heisenberg-Ising Chain in a Longitudinal Field: Many-Body Strings versus Fractional Excitations

Abstract

We report a high-resolution terahertz spectroscopic study of quantum spin dynamics in the antiferromagnetic Heisenberg-Ising spin-chain compound BaCo${}_2$V${}_2$O${}_8$ as a function of temperature and longitudinal magnetic field. Confined spinon excitations are observed in an antiferromagnetic phase below $T_N\simeq 5.5$ K. In a field-induced gapless phase above $B_c=3.8$ T, we identify many-body string excitations as well as low-energy fractional psinon/antipsinon excitations by comparing to Bethe-Ansatz calculations. In the vicinity of $B_c$, the high-energy string excitations are found to be dynamically dominant over the fractional excitations.

arXiv comment6 pages, 4 figures

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• Quench Dynamics of the Anisotropic Heisenberg Model
• Dynamically dominant excitations of string solutions in the spin-1/2 antiferromagnetic Heisenberg chain in magnetic fields
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Cited by in corpus (32)

• Observation of E8 Particles in an Ising Chain Antiferromagnet
• Experimental Observation of Quantum Many-Body Excitations of $E_8$ Symmetry in the Ising Chain Ferromagnet CoNb${}_2$O${}_6$
• Subdiffusive hydrodynamics of nearly-integrable anisotropic spin chains
• Fractional and composite excitations of antiferromagnetic quantum spin trimer chains
• Cascade of singularities in the spin dynamics of a perturbed quantum critical Ising chain
• Confinement and bound states of bound states in a transverse-field two-leg Ising ladder
• Intrinsic transverse field in frustrated quantum Ising magnets: its physical origin and quantum effects
• Phase diagram and quantum criticality of Heisenberg spin chains with Ising-like interchain couplings -- Implication to YbAlO${}_3$
• Spiral-spin-liquid behaviors and persistent reciprocal kagomé structure in frustrated van der Waals magnets and beyond
• Three-body bound states in antiferromagnetic spin ladders
• Quenches and confinement in a Heisenberg-Ising spin ladder
• Experimental observation of repulsively bound magnons
• Confinement in the spectrum of a Heisenberg-Ising spin ladder
• Analytical results for the unusual Grüneisen ratio in the quantum Ising model with Dzyaloshinskii-Moriya interaction
• Quantum phase transitions and composite excitations of antiferromagnetic spin trimer chains in a magnetic field
• Quantum Supercritical Regime with Universal Magnetocaloric Scaling in Ising Magnets
• Phase transitions and spin dynamics of the quasi-one dimensional Ising-like antiferromagnet BaCo${}_2$V${}_2$O${}_8$ in a longitudinal magnetic field
• Magnetic Properties of the Ising-like Rare Earth Pyrosilicate: D-Er${}_2$Si${}_2$O${}_7$
• Spinon confinement in the gapped antiferromagnetic XXZ spin-1/2 chain
• Field-induced antiferromagnetism and Tomonaga-Luttinger liquid behavior in the quasi-one-dimensional Ising-Antiferromagnet SrCo2V2O8
• Zigzag materials: selective interchain couplings control the coexistence of one-dimensional physics and deviations from it
• Spinon continuum in the Heisenberg quantum chain compound Sr${}_2$V${}_3$O${}_9$
• Confinement of many-body Bethe strings
• Repulsively bound magnon excitations of a spin-1/2 XXZ chain in a staggered transverse field
• Inhomogeneous spin excitations in weakly coupled spin-1/2 chains
• Gapless spinon excitations emerging from a multipolar transverse field in the triangular-lattice Ising antiferromagnet NaTmSe2
• Truncated string state space approach and its application to nonintegrable spin-$\frac{1}{2}$ Heisenberg chain
• Bethe strings in the spin dynamical structure factor of the Mott-Hubbard phase in one-dimensional fermionic Hubbard model
• 1/5 and 1/3 magnetization plateaux in the spin 1/2 chain system YbAlO3
• Confinement of spinons in the XXZ spin-1/2 chain in presence of the transverse magnetic field
• Ising spin-1/2 XXZ chain's quantum problems beyond the spinon paradigm
• Dominant Kitaev Interaction and Field-induced Quantum Disordered Phase in the Cobaltate Na${}_2$Co${}_2$TeO${}_6$